Glen, Just regular wood glue.A couple of words of warning if your going to make one. Avoid plastic or those spongy corks, the glue doesn’t bond well to them. I actually had a couple come out and had to replace with real cork.

Pre-measure the corks first before determining the frame, that way they fit nice and you wont have to shave or cut any of them.

One thing I didn’t do but was considering is if you don’t have many corks you could cut them in half. Still should give the cork look, just wont be a raised up. On the other hand I bet the glue would hold them great!

Looks good. I’ve done a coffee table top like that in the past. Was a wood table with glass inserts so I painted some thin plywood black and mounted it with just enough room between it and the glass. Looked great. Unfortunately the table went with my ex-wife. I kept the corks though. Was still a good deal. :)